First of all, I did not create this modloader!
A friend of mine helped me build the base for this modloader, so some of the credit goes to him.
For anyone interested, my friend's online name is TesseractCat.
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This modloader allows users to program mods for Ori and The Blind Forest and load them into the game, hence the name.
It includes a handful of in-game functions to help you with the development of your mods, such as:


The console allows you to see the keybindings to toggle the other windows that are included in the modloader, and it also displays all the mods that have been loaded into your game.



The Debug Window displays all errors that the game logs, so it's most useful for mod developers, but who knows, you might manage to screw something up even without mods! ;)



The Object Browser allows you to see a very, very big list of every object currently in the game. All the object's names come up as buttons that delete the object when clicked on.



The Object Editor allows you to select an object by hovering the cursor over it and pressing LeftShift+MouseLeftControl. You can then, using the window, edit the selected object's position, scale, see it's name, delete it and see a list of every component that is attached to it.



Download the .zip file.
Go to your Steam installation folder, then steamapps\common\Ori\ori_data\Managed.
Unzip the entire contents of the file into that folder.
Accept if prompted to replace files.



First of all, you need an IDE. Download Visual Studio.

Then, open it, and in the left, click New Project. Get your bearings and find C#. From there, create a new Class Library. (Not the one that has Package!)
On the bottom of that window, take note of the Location.

Then, on the right, in the Solution Explorer, rightclick References->Add Reference, and click Browse. Go to the game's Managed folder again, and choose SeinModLoader.dll, Assembly-CSharp.dll and UnityEngine.dll

Then add this code.
Don't know where to add the code? On the right, click Class1.cs or whatever it is named.

I could explain the basics of C# programming, but you should have at least some knowledge on it before you start modding, so go ahead and learn, then come back. ;)

After you're done coding, press LeftControl+LeftShit+B. Give it a little bit, usually around a few seconds.
Then navigate to the Location we covered above, and find a folder called "bin".
Then open it -> "Debug" and grab "YourModName.dll" and place that file in the Mods folder.